JP7362205B2 - Discharge detection device - Google Patents

Description

The present invention relates to a discharge detection device.

As described in Patent Document 1, it is known that a discharge detection unit provided in a distribution board or the like is used to transmit a cutoff signal to a breaker when a discharge event is detected. If it is determined that a discharge event has occurred, the breaker is shut off after a predetermined period of time, but the same process is used whether a discharge event occurs only once or multiple times. .

JP 2017-173008 Publication

By the way, when a discharge accident occurs, the wiring coating deteriorates, the outlet part deteriorates, etc. In other words, it can be said that the greater the number of discharge accidents, the greater the risk. However, no discharge detection device was created from this perspective.

The inventor of this case attempted to solve this problem by intensively studying this point. The problem to be solved by the present invention is to provide a discharge detection device that can change the output of a signal depending on the degree of danger.

In order to solve the above problems, a discharge detection device installed in a wiring circuit includes a noise detection section that outputs a detection signal based on a noise component of a predetermined frequency or higher generated by a discharge event, and a A calculation unit that determines the presence or absence of a discharge event based on a detection signal, a signal output unit that outputs a signal to the outside when a discharge event is detected, and a storage unit that stores that the discharge event has been detected, The calculation unit is a discharge detection device that can change the output of the signal output unit depending on the number of times of detection of a discharge event stored in a storage unit.

Further, it is preferable that the configuration includes a reset section that can reset information on discharge events stored in the storage section.

Further, it is preferable that the configuration includes an output setting section that changes the output from the signal output section based on information input from the user or other equipment.

Moreover, it is preferable to adopt a configuration in which at least one of the blinking interval of the LED or the output interval of the alarm can be made shorter than usual due to an increase in the number of stored discharge events.

The present invention also includes a current detection unit that detects the discharge current of the wiring, a storage unit that stores measurement information of the discharge current, and a calculation unit that changes the output of the signal output unit based on the discharge current information in the storage unit. It is preferable to do so.

According to the present invention, it is possible to provide a discharge detection device that can change the output of a signal depending on the degree of danger.

FIG. 2 is a block diagram of an example of a discharge detection unit including a discharge detection device. It is a flow diagram showing the main flow. FIG. 3 is a flow diagram showing conditions for determining whether or not the number of discharge occurrences increases. FIG. 3 is a diagram showing the detection contents of the noise detection unit and the state of each item. FIG. 7 is a diagram showing the difference between the behavior of an LED and a buzzer when a first discharge is detected and the behavior of an LED and a buzzer when a second discharge is detected. FIG. 3 is a diagram showing the relationship between noise detection and counting the number of times discharge occurs. FIG. 7 is a diagram showing that when the LED blinking flag is turned on, if the LED blinking flag is not turned off by pressing the discharge alert cancel button within a predetermined time, the breaker will be shut off. It is a block diagram showing an example of a discharge detection unit provided with a discharge detection device provided with a current sensor as a current measurement means. It is a figure which shows the example of a usage of the discharge detection apparatus provided with the current sensor as a current measurement means. FIG. 6 is a diagram illustrating an example of the relationship between information stored in a storage unit and output content. It is a diagram showing an example in which a discharge detection unit is arranged between a main breaker and a branch breaker in a distribution board. It is an image diagram showing that the state of each room is detected by a discharge detection unit.

A mode for carrying out the invention will be shown below. The discharge detection device 1 of this embodiment is provided in a wiring circuit. This discharge detection device 1 includes a noise detection section 11 that outputs a detection signal based on a noise component having a predetermined frequency or higher generated by a discharge event, and a noise detection section 11 that outputs a detection signal based on a noise component having a predetermined frequency or higher generated by a discharge event. , a signal output section 13 that outputs a signal to the outside when a discharge event is detected, and a storage section 14 that stores information that a discharge event has been detected. Further, the calculation unit 12 can change the output of the signal output unit 13 by increasing the number of times of detection of the discharge event stored in the storage unit 14. Therefore, it is possible to provide the discharge detection device 1 that can change the output of the signal depending on the degree of risk.

Here, an example of a discharge detection unit 10 incorporating a discharge detection device 1 is shown in FIG. The discharge detection device 1 includes a noise detection section 11, an amplification section 15, a calculation section 12, a storage section 14, and a signal output section 13 on the secondary side of a main breaker 31. A noise detection section 11 that outputs a detection signal based on a noise component having a predetermined frequency or higher generated by a discharge event is electrically connected to the amplification section 15 . The amplification section 15 amplifies the detection signal output from the noise detection section 11. The detection signal amplified by the amplifying section 15 is converted into a digital signal by an A/D converter 16 or the like. By comparing the converted signal with a "threshold value for determining a discharge event" by the calculation unit 12, it is determined whether the noise component detected by the noise detection unit 11 is high-frequency noise. This determination may be made using analog signals such as comparison of waveforms.

The noise detection unit 11 of the embodiment is a high-pass filter, which allows only components of an AC circuit having a predetermined frequency or higher to pass therethrough, and determines the presence or absence of a discharge event from the passed components.

Further, in this embodiment, the calculation unit 12 is connected to the storage unit 14 and records the number of discharge events in the storage unit 14. The calculation section 12 determines the output from the signal output section 13 based on the detection information of the noise detection section 11 and the storage information of the storage section 14 . For example, the timing of output from the signal output section 13 is determined within a specific range, or the output content is determined within a specific range.

It is preferable that the signal output section 13 sends a cutoff signal to the main breaker 31 and the branch breaker 32, and sends instructions to an LED or an alarm. In particular, it is preferable to use a signal from the signal output unit 13 to both shut off the breaker and notify the user of the abnormality.

The discharge detection device 1 shown in FIG. 1 includes a reset section 17. The reset section 17 is formed so as to be exposed on the surface of the discharge detection device 1, and can be operated to reset the LED and the buzzer. For example, after the safety confirmation is completed, the reset unit 17 may be operated to reset the transmission of cutoff signals to the LED, buzzer, main breaker 31, and branch breaker 32. In a normal reset, the information in the storage unit 14 is not reset, and it is sufficient to store that the number of discharges has been added once. By doing so, the number of times a discharge event has been detected can be stored even after resetting.

Further, it is preferable that the reset unit 17 is configured to be able to reset the information on the discharge event stored in the storage unit 14. For example, it is preferable that the information in the storage unit 14 can also be reset by performing an operation different from a normal operation, such as long-pressing the reset unit 17. In this way, "while resetting the LEDs and buzzers, the information in the storage unit 14 is not reset" and "both resetting the LEDs and buzzers and resetting the information in the storage unit 14" are recommended. If you can choose, it will be more convenient to use. This is because it is better to reset the cumulative number of discharges when changing equipment. Note that if the reset unit 17 can be selected depending on how it is used, the number of parts can be reduced.

An output setting section 18 used to control the timing of output from the signal output section 13 is connected to the calculation section 12 shown in FIG. It is preferable that a seismic sensor 50 and a human sensor 51 be connected to the output setting section 18 . For example, when the noise detector 11 detects a discharge event and the seismic sensor 50 detects a seismic intensity equal to or higher than a predetermined seismic intensity, the basic rule is to immediately send a cutoff signal to the breaker regardless of the number of discharges. Alternatively, in a room where there are people, when the noise detection unit 11 detects a discharge event, the output of the cutoff signal can be delayed in order to secure time until the person leaves the room. In addition, when a discharge has elapsed for a predetermined period of time, it is determined that a discharge event has occurred, but even if it is detected that this discharge has occurred continuously for a longer period of time, it is determined that the risk is high and the number of discharges is determined. Regardless, a cutoff signal may be sent to the breaker immediately. In this way, it is preferable that the discharge detection device 1 includes the output setting section 18 that changes the output from the signal output section 13 based on information input from the user or other equipment. Further, it is preferable that the output setting section 18 can change and use the setting for delaying or advancing the timing of the output from the signal output section 13 in accordance with individual conditions.

Basically, the storage unit 14 stores the number of discharge events, but it is preferable to store the date, time, place, etc. where the discharge event occurred. It is also preferable to be able to memorize the interval between discharge events and the discharge current value. If the interval between discharge events is stored, it becomes possible to determine whether or not a discharge event occurs multiple times at short intervals. For example, if a discharge event occurs multiple times at short intervals, the discharge detection device 1 can be configured to output the output from the signal output section 13 in a shorter time than the normal setting. In this way, by using the information in the storage unit 14, it is preferable to have a configuration in which the shutoff process can be performed earlier than usual when specific conditions are met.

Further, when the discharge current value is stored, the discharge detection device 1 can be configured to output the output from the signal output section 13 in a shorter time when the discharge current is large. Furthermore, if the value is not determined to be a discharge event, but exceeds a predetermined threshold value, an LED or the like may be used to alert the user.

Here, an example of how the discharge detection device 1 is used will be explained. In the example shown in FIG. 2, when the discharge detection device 1 is powered on, flags and counters are initialized. Further, the number of discharge occurrences is acquired from the storage unit 14, and the main loop is repeated. Next, two representative main loops that are repeated will be explained.

In the example shown in FIG. 3, first, it is determined whether the noise level is high or low (S001). If the noise level is high, it is determined whether the integrated value of the "noise duration time" has reached a predetermined value (S002). The purpose of determining whether the integrated value of the "noise duration time" has reached a predetermined value is to distinguish instantaneous noise from discharge events that are counted. If the integrated value of the "noise duration time" has not reached the predetermined value, 1 is added to the "noise duration time" (S003). Thereafter, the process proceeds to step (S001) in which it is again determined whether the noise level is high or low. In the example shown in FIG. 3, once the process reaches "end of processing", the process always proceeds to step (S001) in which it is again determined whether the noise level is high or low. Note that the explanation of adding 1 to the "noise duration time" is set to 100 ms as shown in FIG. 4. In other words, when adding 1 to the "noise elapsed time" is repeated, the time is accumulated as 100 ms, 200 ms, and 300 ms. This time may be 1 ms or 10 ms.

The noise level continues to be higher than the reference value, and in the step (S002) of determining whether the integrated value of the "noise duration time" has reached a predetermined value (500 ms for this structure), it is determined that the predetermined value has been reached. If it is determined that the count-up stop time is 0 (S004). Here, the "count-up stop time" is a time period in which even if a discharge event is detected within a predetermined time period (set to 10 minutes for this structure), it is not considered as one discharge event count, as will be described later. Then, it is determined whether the "count up flag" is off (S005). The "count-up flag" determines whether the "count-up stop time" is being measured.

In the step of determining whether or not the "count up flag" is off (S005), if it is determined that the "count up flag" is off, the "count up flag" is turned on (S006), as shown in FIG. Furthermore, the LED blinking flag is turned on (S007). Furthermore, a "discharge alert cancellation time" is set (S008). In the example shown in FIG. 3, the "discharge alert cancellation time" is set to 5 minutes. Furthermore, the number of discharge occurrences is added to the conventional recording and recorded on the nonvolatile medium (S009). The resulting number of discharge occurrences is determined (S010).

In the example shown in FIG. 3, the blinking state of the LED and the operation content of the buzzer are determined based on the number of times determined in the step (S010) of determining the number of times of discharge occurrence. More specifically, as can be understood from FIGS. 3 and 5, when it is determined that the number of discharge occurrences is one, the LED blinks at 500 ms intervals, and the buzzer repeats on and off at 500 ms intervals. Furthermore, when it is determined that the number of discharge occurrences is two, the LED blinks at 100 ms intervals, and the buzzer sounds continuously. In this way, it is preferable to adopt a configuration in which at least one of the LED blinking interval and the alarm output interval can be made shorter than usual depending on the number of stored discharge events. In the example shown in FIG. 3, when it is determined that the number of discharge occurrences is three or more times, N times, the LED blinks at Nms intervals, and the buzzer repeats on/off at Nms intervals. Further, at this time, if it is determined to be a predetermined number of times or more, it can be determined that it is dangerous, so a condition that the breaker is immediately shut off can also be set.

Note that if it is determined in the step (S005) that the "count-up flag" is not off, steps 006 to 010 are skipped and the process returns to step 001. However, the "count-up stop time" is reset and measured from the beginning.

If the noise level is determined to be lower than the reference value in the step of determining whether the noise level is high or low (S001), the noise duration time is set to 0 (S011). Further, it is determined whether the integrated value of the "count-up stop time" has reached a predetermined value (S012). In the step (S012) of determining whether the integrated value of the "count-up stop time" has reached a predetermined value (10 minutes or more), if it is determined that the integrated value has not reached the predetermined value, the "count-up stop time" 1 is added to (S013). Thereafter, the process proceeds to step (S001) in which it is again determined whether the noise level is high or low.

In the step (S012) of determining whether the integrated value of the "count-up stop time" has reached a predetermined value, if it is determined that the integrated value has reached the predetermined value, the count-up flag is turned off (S014).

By the way, if the process proceeds to step 005 again after proceeding to step 012 and before the count-up flag is turned off, a "No" determination will be made in step 005, and from there the process will proceed to step 001. I will move on. In other words, it is possible to avoid proceeding to step 006. Furthermore, if the count-up stop time and count-up flag are not formed as described above, the noise detection unit 11 may measure the number of discharge occurrences many times from step 005 to step 010 in a short period of time. be. In this example, as shown on the left side of Fig. 6, if the noise level continues to exceed a certain level, then decreases for a short period of time, and then rises again, the number of discharge occurrences is summarized. It will count as one time. If the discharge is repeated in a short period of time, it will not be possible to detect it properly if the number of discharges is accumulated for each event, but if the noise level repeatedly rises and falls in a short period of time, as in this example, it can be considered as a single discharge event. Once this happens, you will be able to obtain appropriate detection results.

On the other hand, if it is determined that the integrated value of the "count-up stop time" has reached a predetermined value and the process proceeds to step 005 due to noise detection after passing through step 014, the process proceeds to step 006, so the number of discharges is can be added.

By taking these steps, it is possible to distinguish instantaneous noise from discharge events that should be counted, and even if multiple noise occurrences are confirmed in a short period of time, they can be judged as a single discharge detection. It becomes like this. Furthermore, the output content can be varied based on the difference in the number of discharges.

Next, another main loop will be explained. As can be understood from FIG. 7, first, it is determined whether the LED blinking flag is on (S101). In the step of determining whether the LED blinking flag is on (S101), if it is determined that the LED blinking flag is on, the number of discharge occurrences is determined (S102). The LED and buzzer are operated according to the determined content.

After passing through the step of determining the number of discharge occurrences (S102), it is determined whether or not the "discharge alert cancel button" which is the reset unit 17 has been pressed (S103). If it is determined in this step (S103) that the button has not been pressed, it is determined whether the "discharge alert cancel time" is not 0 (S104).

If the "discharge alert cancellation time" is not 0, 1 is subtracted from the "discharge alert cancellation time" (S105). Then, it is determined whether the "discharge alert cancellation time" is 0 (S106). In this step (S106), if it is determined that the discharge alert time is 0, that is, 5 minutes have elapsed, a predetermined breaker is shut off (S107). Then, electricity is no longer supplied to the wiring where it has been determined that discharge has occurred (S108).

In addition, in the step (S103) of determining whether or not the "discharge alert cancel button" which is the reset unit 17 has been pressed, if it is determined that the "discharge alert cancel button" has been pressed, the "discharge alert cancel time" is set to 0 (S109). Furthermore, the LED blinking flag is turned off (S110). Further, the LED is turned off and the buzzer stops sounding (S111). Thereafter, the process will proceed to step 101 again.

Further, in the step of determining whether the "discharge alert cancellation time" is not 0 (S104), if it is determined that there is 0, and the step of determining whether the "discharge alert cancellation time" is 0 or not. If it is determined in (S106) that it is not 0, the process will proceed to step 101 again.

By the way, the discharge detection device 1 may include a current detection section 19 that detects the discharge current of the wiring. By including the current detection section 19, the output of the signal output section 13 can be determined based on the value of the discharge current. In the example shown in FIG. 8, the current sensor corresponds to the current detection section 19. In this way, the current detection unit 19 that detects the discharge current of the wiring is provided, the storage unit 14 stores measurement information of the discharge current, and the calculation unit 12 uses the information of the discharge current in the storage unit 14 to control the signal output unit 13. Preferably, the configuration is such that the output of the device is changed.

In the example shown in FIG. 9, when the number of discharge occurrences is the first, it is determined how many minutes after which the breaker is shut off based on whether the discharge current is 20 A or more, but when the number of discharge occurrence is the second In this case, it is determined whether the breaker should be shut off immediately or after a certain period of time depending on whether the discharge current is 10 A or more.

Here, an example will be described in which the output mode from the signal output section 13 is changed based on the information stored in the storage section 14. In the example shown in FIG. 10, since there is no information in the storage unit 14 regarding the sensor (1), if the occurrence of discharge is detected in the sensor (1) on April 2nd, a normal signal is output. It turns out. Regarding sensor (2), the number of discharge occurrences is stored once, so if sensor (2) detects the occurrence of discharge on April 2nd, the signal output will be the same as that of sensor (1). It will be output faster.

Regarding sensor (3), multiple discharge events were detected in close succession, so if sensor (3) detected a discharge on April 2nd, it would be necessary to shut it off immediately. It will output a signal. As for the sensor (4), although the discharge event is not large enough to count the number of discharge occurrences, since the abnormal state continues multiple times, the signal output unit 13 outputs an alarm so that a warning can be issued with an LED or a buzzer. Ru.

If it is desired to attach a discharge detection unit 10 including this discharge detection device 1 as a unit to the distribution board 7, it may be arranged as shown in FIG. 11. In the example shown in FIG. 11, the discharge detection unit 10 and the master breaker 31 are connected by an output line 35, and the master breaker 31 can be shut off by a signal output from the signal output section 13. Further, as can be understood from FIG. 12, it is preferable to use the distribution board 7 equipped with the discharge detection device 1 to be able to detect the state of each room.

Although the present invention has been described above using the embodiments as examples, the present invention is not limited to the above embodiments, and can be modified in various ways. For example, the discharge detection device may be formed in a branch breaker. By mounting it on a branch breaker, the size of the distribution board can be reduced.

Additionally, some steps may be added, deleted, or replaced before or after, within a range that does not impede the invention.

1 Discharge detection device 11 Noise detection section 12 Arithmetic section 13 Signal output section 14 Storage section 17 Reset section 18 Output setting section 19 Current detection section

Claims (5)

A discharge detection device interposed so that an electrical connection is made to a wiring circuit to which electricity is supplied ,
A noise detection unit that has a high-pass filter that allows only noise components of a predetermined frequency or higher generated by a discharge event to pass among the electricity flowing through the wiring circuit , and outputs a detection signal based on the noise component that has passed the high-pass filter. and,
a calculation unit that compares the detection signal output from the noise detection unit with a threshold value to determine the presence or absence of a discharge event;
a signal output unit that notifies the outside of the discharge detection device of an abnormality or outputs a signal to equipment located outside the discharge detection device when a discharge event is detected;
a storage unit that stores that a discharge event has been detected;
Equipped with
Even if the detection signal exceeds the threshold while the count-up stop time, which is the time during which the number of occurrences of the discharge event is not counted, the detection number of the discharge event stored in the storage unit does not change. If the detection signal exceeds a threshold while the count-up stop time is not being measured, the count-up stop time is started and the number of discharge event detections stored in the storage unit is increased by one. controlled,
The calculation unit outputs an output from a signal output unit to notify an abnormality to the outside of the discharge detection device, or is located outside the discharge detection device, depending on the number of times the discharge event has been detected stored in the storage unit. A discharge detection device that can change the output from a signal output unit to output a signal to a device . The discharge detection device according to claim 1, further comprising a reset section capable of resetting information on discharge events stored in the storage section. The discharge detection device according to claim 1 or 2, further comprising an output setting section that changes the output from the signal output section based on information input from a user or other equipment. 4. The discharge detection device according to claim 1, wherein at least one of an LED blinking interval and an alarm output interval can be made shorter than usual by increasing the number of stored discharge events. comprising a current sensor that detects the discharge current flowing from the wiring circuit ,
a storage unit stores measurement information of discharge current obtained by the current sensor ;
The discharge detection device according to claim 1, wherein the arithmetic unit changes the output of the signal output unit based on discharge current information stored in the storage unit .

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